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Depending on the content, visual hallucinations can be classified as either simple or complex. [1] Simple visual hallucinations are commonly characterized by shapes, photopsias, and grid-like patterns. [6] Complex visual hallucinations consist of highly detailed representations of people and objects. [6]
A visual hallucination is a vivid visual experience occurring without corresponding external stimuli in an awake state. These experiences are involuntary and possess a degree of perceived reality sufficient to resemble authentic visual perception. [ 1 ]
Peduncular hallucinosis (PH) is a rare neurological phenomenon that causes vivid visual hallucinations that typically occur in dark environments and last for several minutes. Unlike some other kinds of hallucinations, the hallucinations that patients with PH experience are very realistic, and often involve people and environments that are ...
A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [6] They are distinguishable from several related phenomena, such as dreaming (), which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real ...
Panayiotopoulos, C P. Elementary visual hallucinations in migraine and epilepsy. Journal of Neurology, Neurosurgery, and Psychiatry 1994;57:1371-1374. Weller, Michael and Peter Wiedemann. Visual Hallucinations: An outline of etiological and pathogenetic concepts. International Ophthalmology 13:193-199,1989.
Articles relating to hallucinations, perceptions in the absence of an external stimulus that have the qualities of real perceptions. Hallucinations are vivid, substantial, and are perceived to be located in external objective space. Hallucinations are a combination of 2 conscious states of brain wakefulness and REM sleep.
The effect is the result of the brain amplifying neural noise in order to look for the missing visual signals. [2] [better source needed] The noise is interpreted in the higher visual cortex, and gives rise to hallucinations. [3] It has been most studied with vision by staring at an undifferentiated and uniform field of color.
Palinopsia can occur from posterior visual pathway (post-geniculate) deafferentation, which causes homonymous visual field deficits. This mechanism is thought to be similar to the deafferentation hyperexcitability seen in visual release hallucinations (Charles Bonnet syndrome), [ 17 ] which are distinguished from palinopsia by whether the ...